also referred to as a blowfish; big head.
John: "Hey Jack, look there's a reso in the lake.

Jack: "Wow, it's body so small but head so big!"
by anthonyjondoe1111 November 11, 2014
Nickname of Montreal's vast underground city (largest in the world).
When we were in Montreal, we walked around the Reso for hours – shopping and eating – without going above ground.
by bobtheman October 15, 2013
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